Hey guys, this isn't so much a solution as an addition to any of the great solutions already posted. Rather than bury this information in the comments of one of said solutions, I figured I would post it as a solution in hopes more people might see it. If you feel this warrants a downvote, I completely understand.
If anyone is having trouble keeping under the time limit, I would HIGHLY recommend checking out a speedrun of the game. The world record is about 40min at this point and some of the exploits they utilize are very simple to do and save a TON of time. Obviously there are some I wouldn't recommend trying as they are very high risk with little reward. However, adding even a few of these methods to your run would not only help you shave some time off, but I find it lets me be a little more careful while crossing those damn pipes/rafters to ensure I don't blow my run.
Here is a Reddit post that includes a few good skips you can use:https://www.reddit.com/r/speedrun/comments/68h589/little_nig...
And here is a speedrun I watched that help me visualize some of those skips:
I take no credit for any of this information, I simply found it very helpful and hope it helps some other people get this b*tch of an achievement.
Happy Gaming People!